Hi, i wrote a small helper library which allows applications to change their realtime-priority without having root privilege. the method is similar like utempter library: the library forks and execs the checker program which is set as setuid-root. then the checker proves the invoking application and user (group or host) is registered in the list, and if it's ok, changes the RT-priority of the process. since each user and each application is tested, it's more secure. the advantage is also that no special kernel patches are necessary. the changes needed for applications are only - add the following: #define WRAPPER_USETSCHED #include <usetsched.h> - link with -lusetsched i've tested (modified) jack and timidity. so far, it looks working fine. the detailed info is found at http://www.alsa-project.org/~iwai/usetsched/index.html the jack-patch is being prepared now. will be ready tomorrow. ciao, Takashi